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A candle flame has 3 parts - innermost zone, middle zone and outer zone
Innermost Zone (Dark)
It is the innermost zone
It is least hot part of flame
It is unburnt part of flame containing wax vapours as combustion is not completed because of lack of oxygen
Middle Zone (Yellow)
It is the Luminous Zone (it means that it produces light)
It is middle most part of flame
It is most luminous(produces most light)
There is partial combustion so it is moderately hot
It is of yellow colour
Other Zone (Blue)
It is the non Luminous Zone (it means that it does not produce light)
It is outermost part of flame
It is of blue colour
There is complete combustion here, hence it is very hot
Questions
NCERT Question 13 -
Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get heated in a shorter time?
View Answer
Which zone of the flame should the goldsmith use for melting metals?
